Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51247e074ba64ef…

MALICIOUS

PDF

77.0 KB Created: 2021-09-05 22:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6da6e26e75eedda050be4cfbd0d07b5d SHA-1: c3659473173b0758896a4a20398cadb140666697 SHA-256: a51247e074ba64efebc84431a40faccc59a6c97af9fb24a67b643271eff8ca19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various websites. Heuristics indicate a link farm on disposable hosting and compromised CMS uploads, suggesting a malicious intent to distribute content or manipulate search results. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/1kdisg67uo6tav9499ctgqqlkg/viwajafibajojusen.pdf In PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/jasavajirevasivefupene.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/2447096501.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/41184715152.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16097d1bd8b22e---kuzikodibida.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/49275879502.pdfIn PDF document text
    • http://tochalco.com/uploads/files/gaxonademeb.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/63dca6d640b5b71959290fb940be4e04/20366220981.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/gujuxovomeguwi.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cab65f76c---14016678176.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/gibebirok.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16081adb27736a---rorutikop.pdfIn PDF document text
    • http://iphysiology.ru/upload/29606653324.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/3bm2f8phmea7j2c6a0euf82ir3/32908950802.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8b771956c---sezodifugebulifelu.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/54b7f9cf6326ac765189c59b657fb655/68183382675.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160822a7d10165---laxenilogiza.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/abc63447bc96253514ae01ae5ea75b53/453624067.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/dafumatug.pdfIn PDF document text
    • http://laduses.nl/image/file/77959099295.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/11e6c3187da49e09026f765d6557d3aa/xinog.pdfIn PDF document text
    • http://topstec.com/d/files/sagemimufidepew.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c15ad1a727e---narezom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=hurst+critical+thinking+application+nclex+review+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D2 17188 bytes
SHA-256: fbb28bfd7b9d374ac2cef27df293b66ae2d3aca7e2ccf47528f57a6e39880b3e
font_01_sfnt_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 11336 bytes
SHA-256: 001962fc7e178aa08dd46d7a731266267553bf8ccea806d2b8eedc5909cba6c7
font_02_sfnt_off00010dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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